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PENSIONS - Employer Contributions and Payments (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
UK Scheme  
Pensions:  
Employer contributions $ 592
Estimated future benefit payments:  
2016 444
2017 296
2018 444
2019 296
2020 370
2021 - 2025 2,590
Marine Scheme  
Pensions:  
Employer contributions 1,800
Estimated future benefit payments:  
2016 3,000
2017 3,000
2018 3,000
2019 3,000
2020 3,000
2021 - 2025 $ 15,000